CT reconstruction of the abdomen and pelvis showing arteriosclerotic changes and an aneurysm (red) of the largest artery in the abdomen. This artery, the abdominal aorta, transmits blood from the heart to the abdomen, pelvis and lower extremities. The yellow structure near the top left portion of the image is the left lobe of the liver. Just above that the rounded blue-yellow structure is the heart. The green structures in the abdomen and pelvis represent segments of the intestine. There are degenerative changes of the lower thoracic and lumbar spine which are on the right. Aneurysms represent an abnormal dilatation of an artery. This can increase in size over time. High blood pressure can accelerate the growth. Eventually if the aneurysm becomes large enough it can rupture/tear and cause potentially lethal bleeding (hemorrhage).
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